int max_height = H2I(TGPGetMaxHeight());

    /* Transfer height map into OTTD map */
    int h0_tile_count = 0; // count tiles at sea level
    for (int y = 0; y < _height_map.size_y; y++) {
        for (int x = 0; x < _height_map.size_x; x++) {
            int height = Clamp(H2I(_height_map.height(x, y)), 0, max_height);
            if (height == 0) h0_tile_count++;
            TgenSetTileHeight(TileXY(x, y), height);
        }
    }

    if (_settings_game.game_creation.landscape == LT_ARCTIC) {
        int land_mass_size = _height_map.size_x * _height_map.size_y - h0_tile_count; // available tiles above sea
        int tile_count = 0, cur_height = 1;
        while (tile_count < land_mass_size * 2 / 3 && cur_height <= max_height) {
            for (int y = 0; y < _height_map.size_y; y++) {
                for (int x = 0; x < _height_map.size_x; x++) {
                    if (TileHeight(TileXY(x, y)) == cur_height) tile_count++;
                }
            }
            cur_height++;
        }

        _settings_game.game_creation.snow_line_height = Clamp(cur_height, MIN_SNOWLINE_HEIGHT, MAX_SNOWLINE_HEIGHT);
    }